r/Wrangler

2007 JK – P0300 misfire under load, stalling, lean codes, runs fine at idle

Hey all—if anyone happens to be near Meridian, ID and would be willing to take a look or help diagnose in person, I would truly appreciate it.

I’ve also uploading a video with this post showing how it idles.

Looking for some help diagnosing an issue that came up after doing some maintenance. I’ve done quite a bit already and trying not to just throw parts at it. When I purchased it, it wasn't throwing any codes, but it could barely steer due to the missing sway bar links and needing a steering stabilizer, but these problems didn't seem to be present.

Vehicle:

- 2007 Jeep Wrangler JK (3.8L)

Recent work completed:

- Replaced spark plugs

- Replaced plug wires

- Replaced ignition coil (aftermarket ECCPP), then swapped back to original coil

- Replaced valve covers

- Replaced serpentine belt

- Replaced both front sway bar links

- Steering Stabilizer

Current symptoms:

- Idles fine (let it run 30–45 minutes with no stalling)

- Under load:

- Accelerates okay up to ~30–35 mph

- Struggles to go faster (feels like limp mode)

- CEL starts flashing

- Severe loss of power (can barely maintain ~10 mph)

- Engine will stall while driving

- After stalling, it won’t restart immediately but will after sitting a few minutes

- Engine seemed to get very hot during a short drive (but the temp gauge stayed in the middle)

- Brake light flashed intermittently during the issue

Codes:

- P0300 (random misfire)

- P0131 (O2 sensor low voltage)

- P0137 (O2 sensor low voltage)

Additional info:

- Cleared codes after swapping coil, P0300 returned but not seeing the O2 sensor codes but I haven't tried driving it again.

- Runs smoothly at idle, no major sputtering

- Issue only shows up under load / driving

- Coolant level is good

- No obvious vacuum leaks seen yet, but haven’t done a full spray test

- This all started after the recent maintenance listed above

What I’ve ruled out so far:

- Ignition coil (swapped back to original, no change)

- Basic idle issues (runs fine at idle for extended time)

Appreciate any insight—feels like I’m close but want to be smart about the next step.

u/Vegetable_Wolf6193 — 10 hours ago
🔥 Hot ▲ 229 r/Wrangler

Realizations after driving a Jeep for 10 years now

Hi,

This is my personal opinion only and I do not intend to judge / offend / ridicule anyone out there. Here are my top 5 realizations after driving a Jeep Wrangler for 10 years (2016 JKU Sahara 6-speed Manual)

  • Jeep wave is a dying trend (at least where I live in the Greater Toronto Area) and the duck thing is taking over
  • I got a 1.5" budget lift kit (CA $ 1,600 installed) and I think my ride quality became noticeably poorer. The spacer lift kits are just an eye candy - nothing else. Please note, that my struts (spring + damper) were also replaced as part of the kit. I did it to make the upgrade to 33" BFG KO2 look a bit more natural (and not the typical mall-crawler look). But I have heard a metal-to-metal knock several times when going over large potholes at non-highway speeds. If I can go back in time, I won't upgrade to a budget lift kit.
  • Unless you're an avid off-roader (important), keeping the Jeep in its stock form is the best thing to do. Get the meaningful mods (like the essential LED headlight upgrade).
  • Wind noise is real and there is no real solution. It gets worse every year and highway driving for long hours can become stressful. So if you're considering buying a Jeep, keep this in mind. I am sure there are expensive solutions out there. But I have been inside a Jeep with floor and roof sound dampeners - it keeps the Jeep cooler for sure, but the road/wind noise reduction is negligible.
  • Winter tires are better than any A/T tires out there. BFG KO2 sucks on wet roads, especially if you're making a sharp turn like a round-about.

Please let me know your thoughts.

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u/fakeyankee1 — 1 day ago
▲ 5 r/Wrangler+1 crossposts

Electronic sway bar disconnect question

Finally played around with my JLUR sway bar disconnect option this past weekend. Shifted into 4H and hit the disconnect button, sway bar disconnected after a few seconds as expected. Pulled up onto this rock, stopped, pulled the E break (manual transmission), shut it off and got out to admire the stock flex with the sway bars disconnected. After a few minutes of taking pictures and picking on myself for being so excited for something so simple, I jumped back in, started it up and the sway bars immediately tried to reconnect. I quickly threw it into reverse and backed off the rock in a mild panic that something might get damaged with the system trying to reconnect while fully articulated... The sway bars did end up completing the reconnect (without any input from me) after backing off the rock.

This left me with 2 questions:

  1. Why did the system automatically attempt to reconnect the sway bars? Is this a standard thing with shutting it off and restarting while the sway bars are disconnected? Seems like a really bad design if so... I know that they will reconnect automatically if you go over a certain speed.
  2. Could this have potentially damaged something if I didn't quickly react to the dash telling me it was "Attempting to reconnect sway bar" as soon as I started it up and backed down off of the rock? Sorry, I'm a newb with off roading.

https://preview.redd.it/3us4nsfe9dwg1.jpg?width=4000&format=pjpg&auto=webp&s=b53f0bb684cbd0c1ae694fe32d4378d5907c8e00

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u/alter_ego311 — 18 hours ago

Hinge replacement

I have rusty bolts and I am trying to replace the door hinges. I have the hinges bought but I can’t get one of the bolts to come off the door as it’s stripped and all rusty.

Anyone have any suggestions on how to get it off?

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u/Icy_Firefighter1719 — 13 hours ago

Advice from NY Wrangler owners

I'm looking at buying a used Wrangler, and one I'm considering was originally registered in NY. I'm in Socal. I'm concerned about road salt. What's your experience with rusting on 2021/2022 JLUs? Any area I should inspect to see if its a problem? Should I just avoid it all together? or am I over reacting?

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u/ontheleftcoast — 21 hours ago
🔥 Hot ▲ 64 r/Wrangler

New to me 20 days 16 Jk

Had to get this 2 door hydro blue. Had a Prius then a civic now a JK. I see the difference in MPG now.

u/VariousWolf7245 — 1 day ago
🔥 Hot ▲ 87 r/Wrangler

2 weeks in.

Two weeks now since getting my 21 2.0T JLUR. Figured I’d add some thoughts. I had an 06 TJ about 12 years ago. So going based off what I remember from that.

- the road manners are 10x better than my TJ was. Still handles like a barn but overall ride quality is so much better. Which is good since I have a family now

- love the power from the 2.0T. My 06 couldn’t get out of its own way (got passed going up hill by a dump truck filled with rocks while I was WOT lmao). Has great low end torque and passing power when I need it but is also really well behaved in the MPG department when you’re nice to it. It also sounds like a tractor which I personally love.

-The 8 speed is fantastic, a bit clunky when cold but a great transmission and worlds better than the 42RLE I had in the TJ.

Most importantly. My family loves it, especially my daughter. She’s now always asking for jeep rides and to “let her hair go crazy” which makes me so happy. Cause I traded in a 2023 civic for this and never got “can we go for a ride in the Civic?” 😂. It was a great car don’t get me wrong, but it’s nice to have something fun again!

u/Firm_Tooth5618 — 1 day ago
▲ 5 r/Wrangler+1 crossposts

2018 Wrangler Sahara - California Smog Check Issue

Sorry for the blurry image. I had to take a quick pic. I have brought my wrangler to a smog check place 6x and it keeps coming back with a “not ready” - EGR and/or VVT System states OBDII Monitors not ready. Just had another fail today. The smog guy just keeps saying I need to drive more. I’ve driven well over 150 miles and in a way that chat gpt says will help. It does not. I bought a diagnostic tool too. I’m at a loss and wondered if anyone here has had to deal with this. I’m going to try another smog check place I think.

Any help or advice would be greatly appreciated.

u/eternalsurfer — 1 day ago

JKU Cup holder that sits on rear middle seat?

Hey I’m trying to find a cup holder that I can strap to the middle seat or something along those lines for my Wrangler Sport JKU. I have a 4 year old in a car seat and we take some long trips to do some light wheeling. I’d like him to be a little more autonomous with drinks and food while on these drives. Maybe im really bad at internet 2.0 but I can not find anything. Any suggestions?

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u/clueless_bjj — 1 day ago
🔥 Hot ▲ 76 r/Wrangler

I think I just found the holy grail on marketplace

So I was scrolling through marketplace and since 1 am a huge Jurassic Park fan, I casually look at 90s era wranglers so I can make a replica from the movie.

I stumble across this post and I assume the price is a clickbait price, but this person is giving away 2 jeep wranglers, one 93 and one 94 for $5,000 total WITH extra parts included. One is in pretty crap condition, but the other is pretty well maintained.

I don't know much about cars. I know the basics as most people do, I know that rust is extremely bad on wranglers (especially old ones), and that's pretty much it.

Fellow jeep enthusiasts, I need to know what kind of things I would need to look for if I were to purchase these. I'm well aware this is a very good deal, but like I said I don't know much as of yet considering I haven't even started a jeep project yet. One major question I have is on the 93 (green one). I spot some rust on that one, are those spots of concern? Can they be easily repaired? I'm not REALLY concerned about the 94 red one since it's basically a parts car, especially with the frame rust.

u/Adriansilas415 — 2 days ago

My 2015 Jeep Wrangler 3.6

https://preview.redd.it/dyjlhg3am6wg1.jpg?width=3632&format=pjpg&auto=webp&s=d70ef211bf4685f67cec03499ea2d99ee5773188

Being a first time Jeep Wrangler owner the experience is better than what Jeep Wrangler critics make it out to be. I bought this 2015 Jeep Wrangler Sport JK at 86,000kms for $18,000. I am coming from owning a prior Dodge Ram full size and 5 other prior Ram trucks. The ride is a little more stiff, choppy and rugged but is comfortable. A shorter wheel base plays a part and changes the ride. It being a JK Sport stock the noise level is pretty good and not far from being as quite as my full size prior Dodges. Yes it also helps that I upgraded the sound system which drowns out all the odd road noises which is not much road noise. I am sure there is a lot more road noise with higher Jeep trim levels with bigger tires but I was looking for something more practical for a everyday commuting vehicle and is much cheaper for repairs. I like the Jeep for how simple and basic it is for maintenance verses all the newer higher end trims of todays Jeeps with computers etc. Keeping it stock also prolongs the life and helps it at a advantage plus the price value. Bare bones is even better for some people looking to build from the ground up a stock well maintained Jeep JK. Buying a already modified Jeep you never know what the prior owners did plus how hard the drove the Jeep plus if they ever screwed up on something. I look forward to the experience. Yes it can have its draw backs like fuel consumption and fighting the ride quality sometimes during wind but that's the Jeep experience. Adding this low profile Kicker sub was the best upgrade for the size and its space saving dimensions and freed up the entire back cab. The sound is actually impressive for its size and hooked directly from my stock oem radio. I upgraded the rest of my 8 speaker system with speakers from powerbass.

https://preview.redd.it/kop4og9fk6wg1.jpg?width=5456&format=pjpg&auto=webp&s=45b5516cadf2fc832bfcdea9ed616586136bda50

https://preview.redd.it/05ye9tqhk6wg1.jpg?width=5456&format=pjpg&auto=webp&s=0b4553f4099b69f04e60a59d8be683ab4af7687e

https://preview.redd.it/3clg4xxjk6wg1.jpg?width=3632&format=pjpg&auto=webp&s=1a7a76ee1d271243cadfd54e2ebcc8cffdaf6da7

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u/Smooth_Grade853 — 1 day ago
▲ 8 r/Wrangler+1 crossposts

$50K Jeep magically turns into $60K 🫠

Saw a Wrangler listed for $50,071. Asked for the out-the-door price and they came back at $60,070.That’s basically a $10K jump from the listed price. I get taxes and fees, but this seems excessive.

Are these markups normal now or is this dealership just wild?

u/EstablishmentTall431 — 2 days ago

2007 JK – Severe power loss, misfire, stalling, and running hot after short drive

Hey all, looking for some help diagnosing an issue that came up suddenly.

Vehicle:

- 2007 Jeep Wrangler JK

Recent work:

- Replaced spark plugs

- Replaced plug wires

- Replaced ignition coil

- Replaced valve covers

- Replaced serpentine belt

- Replaced both front sway bar links

Current symptoms:

- Accelerates fine up to ~30–35 mph

- Struggles hard to get to 40 (feels like limp mode)

- CEL starts flashing

- Power drops drastically (can barely go 10 mph)

- Engine stalls

- Won’t restart immediately, but will after sitting a few minutes

- Had to limp it home with it dying again once

- Engine seemed very hot after a very short drive

Codes:

- P0300 (random misfire)

- P0131 (O2 sensor low voltage)

- P0137 (O2 sensor low voltage)

- U1417

- B1640

- C1020

Additional info:

- It idled smoothly before driving

- Coolant level appears normal (checked after cooling down)

- No obvious leaks under the hood at first glance

- Brake light randomly flashed during the issue

- Issue seems to get worse as the vehicle warms up

My thoughts so far:

- Failing fuel pump (especially under load/heat)

- Fuel delivery issue

- Electrical/ground issue

- Something I may have bumped or left loose while doing the recent engine work

- Possibly old gas (but not convinced that explains everything)

Questions:

- Does this sound like a fuel pump going bad?

- Anything specific I should check first before replacing parts?

- Any common JK issues that match this combination of symptoms?

Appreciate any help—this one came on pretty suddenly and has me a bit stuck.

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u/Vegetable_Wolf6193 — 1 day ago
▲ 7 r/Wrangler+1 crossposts

Would you consider this 392?

Found a ‘24 392 in Anvil and red seats brand new with 124 miles on the odo. Listed at $79k.

I know I can get a Moab for the same price but I don’t like the painted top black fender flare look.

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u/Shalashaska19 — 3 days ago

Charging port issues

Hi yall I have a 2015 jeep wrangler sport. I think I accidentally pulled to hard on the charging port thing and it wont charge my phone. My phone and the actual charger cord work as I tested it out. As you can see in the picture I pulled it out completely just now. I hope I didn’t make it worse. Im not knowledgeable in cars at all so if you guys could I guess tell me where to go or if I just go to my usual mechanic to fix this that would be great. Thank you in advance.

u/Adventurous_rae — 4 days ago

Are wranglers in my country cheap? 2014 112k 7k USD.

2014 manual no issues 7k usd 112k miles. looks like it has a lot of mods. i see those all day.

u/Saud_k — 5 days ago

Price of an Unlimited Sahara in Costa Rica

The reality here. Out of the reach of pretty much everybody. And of course it gets reflected in the used market. Pretty much forces us to just to buy chinese cars.

u/malavassi — 3 days ago